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Hagen Marina AquaVac is a complete gravel cleaner and water changing system. Water pressure from a home faucet and the suction pump drive the AquaVac system, which siphons water out of your aquarium. This system includes all equipment you will need to hook the up to both standard faucets, industrial faucets and outdoor hose faucets.

Includes:
-Brass adapter for standard faucets
-Female hose adapter to connect to most industrial faucets and outdoor hose faucets
-Valve to regulate the water flow when cleaning or filling your aquarium
-Suction cup bracket that insure the gravel cleaner stays in place when starting the water
-Fish guard strainer to ensure the safety of the fish when the aquarium is being drained
-Gravel guard that ensures that no gravel is trapped in the hose when cleaning the aquarium

The gravel guard at the top of the siphon tube would certainly be effective in preventing fish from being accidentally sucked up, as it will also catch plant leaves and other debris. However, this does mean if you have a particularly messy tank, you will want to clear that portion of your vac by starting the water return over your waste area.

The O rings on my valve were not installed properly and were flattened on one side.

I bought this because using buckets gets messy and cumbersome. No mor fuss. It takes me longer to scrub the alge off the glass than to change some water. I have been using this for two and a half years since I got back into keeping fish. Absolutely love this.